PMID:14983066

Citation	Shukla, A, Raje, M and Guptasarma, P (2003) A backbone-reversed all-beta polypeptide (retro-CspA) folds and assembles into amyloid nanofibres. Protein Eng. 16:875-9
Abstract	The backbone-reversed or 'retro', form of a model all-beta-sheet protein, Escherichia coli CspA, was produced from a synthetic gene in E.coli in fusion with an N-terminal affinity tag. Following purification under denaturing conditions and dialysis-based removal of urea, the protein was found to fold into a soluble, poorly structured multimer. Upon concentration, this state readily transformed into amyloid nanofibres. Congo Red-binding amorphous forms were also observed. Since a beta-sheet-forming sequence is expected to retain high beta-sheet-forming propensity even after backbone reversal and given the fact that folding of retro-CspA occurs only to a poorly structured form, we conclude that the increase effected in protein concentration may be responsible for the formation of intermolecular beta-sheets, facilitating the bleeding away of the protein's conformational equilibrium into aggregates that generate well-formed fibres. Since every molecule in these fibres contains a peptide tag for binding Ni(2+), the fibres may provide a template for deposition of nickel to generate novel materials.
Links	PubMed Online version:10.1093/protein/gzg142
Keywords	Amyloid/chemistry; Amyloid/metabolism; Bacterial Proteins/chemistry; Bacterial Proteins/metabolism; Chromatography, Gel; Circular Dichroism; Escherichia coli; Microscopy, Electron; Protein Conformation; Protein Folding; Spectrometry, Fluorescence
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